/Engine/Source/Runtime/Experimental/Chaos/Public/Chaos/SimCallbackObject.h
Typical gear ratios: Reverse −4.181, 1st 3.818, 2nd 2.294, 3rd 1.500, 4th 1.133, 5th 0.911 Source: Georg Rill. Road Vehicle Dynamics: Fundamentals and Modeling (Ground Vehicle Engineering Series) (p. 121). CRC Press.
namespace Chaos { enum ESimCallbackOptions { Presimulate = 1 << 0, MidPhaseModification = 1 << 1, CCDModification = 1 << 2, ContactModification = 1 << 3, StrainModification = 1 << 5, ParticleRegister = 1 << 6, ParticleUnregister = 1 << 7, RunOnFrozenGameThread = 1 << 8, Rewind = 1 << 9, } }